Support configurable variables of record & table types

[HindujaB]

Purpose

• Add support for record type configurable variables
• Add support for table type configurable variables

Fixes #28091

Approach

1. Record type

Ballerina context

type AuthInfo record {
  readonly string username;
  string password;
  string[] scopes?;
};

configurable AuthInfo & readonly testUser = ?;

Toml context

[Pkg.testUser]
username = "john"
password = "abcd"
scopes = ["write"]

2. Table type

Ballerina context

configurable table<AuthInfo> key(username) & readonly users = ?;

Toml context

[[Pkg.users]]
username = "alice"
password="password1"
scopes=["scope1"]

[[Pkg.users]]
username = "bob"
password="password2"
scopes=["scope1", "scope2"]

Samples

Remarks

related issues
ballerina-platform/ballerina-library#862
ballerina-platform/ballerina-spec#709

The following aspects are considered in implementation

• Record fields with complex types are yet to be supported
  (Supported field types : int, float, string, boolean, decimal & array of these types )
• Including additional fields for open records through configuration is not supported. (due to TOML type mapping)
• Map type is not supported
• Table with multiple keys is yet to be supported

Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[warunalakshitha]

LGTM